Hi Booklover, I seem to have injured my LTN in a fall from a bike several years back and have been working on reactivating my right serratus. I can feel a muscle contracting beneath my armpit even if i move my right arm up. Does that mean I can rehab the muscle? Any idea of teh time I'd take and the specific exercises and other muscles to focus on along with it?Also what wre your symptoms. Mine are bilateral TOS, right is (i think) due to serratus issue. Left is due to injured longus colli which is not stabilizing my cervical spine. I have constant pain in my right shoulder/neck area, I think overstressed levator and upper trap and also a supraspinatus injury probably.